LeetCode Problem Statements

leetcode-problem-statements.md

LeetCode Problem Statements

Here's a list of beginner-friendly LeetCode problems covering various data structures and algorithms:

1. Arrays
   • Two Sum
   • Find the Index of the First Occurrence of a Given Element in an Array
2. Linked Lists
   • Reverse Linked List
   • Remove Nth Node From End of List
3. Stacks
   • Valid Parentheses (use a stack to check for balanced parentheses)
   • Minimum Size Subarray Sum (use a stack to find the smallest subarray with a given sum)
4. Queues
   • Implement Queue using Stacks
   • Shortest Completing Word (use a queue to process words based on a given dictionary and requirements)
5. Trees
   • Construct Binary Tree from Inorder and Postorder Traversal (a good introduction to tree traversals)
   • Validate Binary Search Tree
6. Heaps
   • 3Sum (use a heap to find the closest triplet)
   • Kth Largest Element in an Array
7. Hash Tables
   • Two Sum II - Input array is sorted (use a hash table to find pairs with the given sum)
   • Longest Substring With At Most Two Distinct Characters (use a hash table to track characters in the current window)
8. Dynamic Programming
   • Fibonacci Number
   • Climbing Stairs (a simple problem that demonstrates the concept of overlapping subproblems)
9. Greedy Algorithms
   • Maximum Product of Pairwise Product
   • Largest 3 Sum (a good example of finding the maximum sum with a greedy approach)
10. Graphs
    • Course Schedule (use topological sorting to check if it's possible to graduate given prerequisites)
    • Number of Provinces (a simple problem that demonstrates the concept of connected components in graphs)